Sorry 25 watt no longer available
TMC Pond Clear Advantage 15  watt UVC 
 1 year warranty

Supplied with demountable blue hose tails to fit 0.5" to 1.25" hose, 13 mm to 32 mm

Can also be used with rigid pipe by using the supplied Black fitting to fit in to 43 mm/1.5" solvent waste,this also fits 38 mm id hose 1.5"
Very reliable older style electrics,sadly no longer manufactured,we probably have the last few units available in the country.